Grinding-machine.



G. B. HESS.

GRINDING MACHINE.

APPLICATION FILED JUNE 27, 1912.

1,085,863, Patented Eeb.3,1914.

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'QLL As M C. B. HESS.

GRINDING MACHINE.

APPLICATION FILED JUNE 27, 1912.

1,085,863. Patented Feb. 3, 1914.

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6/ mmssse's: I lMfA/Tal? czar/ 8 22 2%? Patented Feb. 3, 1914.

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' tion, of parts shown at the righthand in .,to:side onthe bed. .N-o mechanism is shmvn;

UNITED STATES PATENT OFFICE.

CHARLES BURGESS HESS, OF IHILAIDELPHIA, YENNSYLVANIA, ASSIGNOR TO STAND- ARI) ROLLER BEARING COMPANY, OF PHILADELPHIA, PENNSYLVANIA, A CORPO- mr'rroiv or NEW JERSEY.

GRINDINBMACHINE.

Specification of Letters Patent.

, Application filed June 27, 1912.

Patented Feb. 3, 1914.

Serial No. 706,166.

To all whom it may concern I Be itknown that 1, CHARLES Boneless Hnss, a citizen of the United States, residing at- Philadelphia, in the county of Philadelphia and State of Pennsylvania, have invented certain new and useful Grinding- Machines, of which the following is a specifiv cation.

The principal object of the present invention is to provide a machine for automati cally grinding taper roll blanks or even cylindrical roll blanks accurately to size and angle, and another object of the invention is to do this in an economical and expeditious manner. v

Other objects of the invent-ion will appear from the following description taken in connection withv the accompanying drawings in which is illustrated an embodiment selected from other embodiments of the invention for the sake of explanation.

In the drawings, Figure 1, is a transverse sectional view illustrating parts of a grinding machine fitted with mechanism embodying features of the invention. Fig. 1 is'a; view', neatly in section and partly in elevaf-g t-ion, drawn to an enlarged scale, and ill'us-i: tinting a detail. Fl .2, is a top or plain view, with parts bro en away, of the ma chine shown. in Fig. 1. Fig. 3, is a front; View, with parts broken away, of the ni acbi-ne shown in Fig. 1. Fig. 4, is a sect-ionalf view-taken on the line 4-4 of Fig. 2, and} drawn to an enlarged scale. Fig. .5,.is an" elevational View, principally in central sec-5:

Fig.2 and drawn to an enlarged soalef. Fig-j i6, is a transverse sectional view drawn to enlarged scale of parts shown at the front in Fig. 2, Fig. 7, is a top or plan view of other? parts shown at the front in Fig. 2, and F g.

In the drawingsllis the bed or frame oil the machine, 2, is a tablejthat is reciprocated from s de for reciprocating this table since the bed, the table and the mea'nslfor reciprocating the latter are usual and well understood parts of a grinding machine.

3, is the grinding wheel and it may he 5 carried by the slide 6 movable back and front in ways oi guides on the bed or frame 1. Mounted on the table is a base 7 which by' the clamping pivot'8 can be set at any required inclination to the axis of the grind ing wheel- The inclination is usually,

.though not necessarily, something like two or three degrees, so that no attempt has been made to show it on the drawings. There are cup centers 9 and 10; the cup center 9 is carried by the head stock 11 driven by thep illey l2 and connected with the table 2, for example, by Way of thebase 7. The cup center 9, While rotatable is not aflorded endwise motion. The cup center 10 is carried by the tail stock 13, which is slidable in ways 14 in respect to the table 2. Inasmuch as the machine under consideration is intended to grind taper rolls, the general form of the cavity in the cup centers is conical, but the form may be somewhat varied.

15 is a hopper, the lower sidewalls of which are shown as broken away in Fig. 1. The blanks a are fed into this hopper.

15 is a slide that carries a spring 16 between the. depending portion of which and the concavity'at the-rear. upper corner of the slide, the blank issupported so that when the slide moves toward the back it carries with it a blank a, the bottom blank in the hopper resting upon the top of the slide. The blank thus carried backward by the slide is received by the cup centers as willbe explained.

17, is a cam shaft revolubly supporteddrives this shaft or runs loose on it'according to the adjustment or position of the members of the clutch 19. "The shaft 17 remains atrest during the grinding operation and j d by-mgansof thehul-ley 4, The-grind} yf llower np to 20 and for thepuriivheel i iievoli bgly, supported by brackets 1 Rose cit-normally ipnoj ecting the cup center 10. The camshaft 17 also carries a cam 27 which operates the slide against the force of its retracting spring 28. This cam shaft 17 also carries a cam 29 which serves to throw feed pawls to be hereinafter described, out of operation when the grinding wheel is to be returned or shifted away from the work. This cam shaft 17 also drives a shaft 30 through the intervention of a worm and worm wheel 31. The shaft 30 operates to drive a pulley 32, under certain conditions to be described, and this pulley 32 is belted to a pulley 33 on a shaft 34 geared to a worm shaft 35, which by rack and pinion 536, feeds the slide 6 and with it the grinding wheel 3 in respect to the work. The belt between the pulleys 32 and 33 may be somewhat elastic on account of the fact that the pulley 32 moves with the table 2, whereas the pulley 33 is revoluble in the bed or frame 1. 1 v

37 is a cam zi ctuated clutch member or sleeve, rotatable with the shaft 30, but endwise movable on it so that when the shaft =1 30 revolves, its cam-shaped end running on the roller 39 (Fig 2) causes it to be shifted against the fOPCQz-Of the spring 40 so as to engage the pulley '32.

41, is a ratchet feed wheel mounted on the shaft 34. e

42, is a centrally pivoted lever, one end of which is hit by stops 43 on the table 2 so that as the latter reciprocates the lever 42 is vibrated. "he heart-shaped end 44 of the lever 42 operating upon a roller 45 on a spring retracted lever 46, pivoted at 46, vibrates the lever. The lever 46 is connected by a link 47 with a pivotal arm 48, the free end of which carries a pawl 49 adapted to operate on the teeth of the wheel 41 and also another pawl 49.

50 is a lever nevolubly, mounted on the shaft 34 and prihvided with a clamp 51 by means of which it can be secured in various angular positions to the ratchet wheel 41. This lever 50 is also provided with a guard 52 extending over some of the teeth of the ratchet wheel so as to prevent the pawl 49 from engaging with the teeth over which it extends.

53, is a lever revoluble on the shaft 34 and provided with ratchet teeth 54 which are not covered by the guard 52 and are engaged by the pawl 49. This lever 53 is connected by a spring 55 with the lever 50 and it is provided avith an arm 56 and with an adjusting screw 57 that bears upon the lever 50 by the force of the spring 55 under normal conditions.

58 is a clutch'rod endwise slidable in brackets 59 fixed on the frame 1 against the force of the spring 60.

61, is a pivotal lever normally held by a spring 62 against the part of the rod 58 of smaller cross-section and out of line with the end 63 of a lever pivoted at 64- and acted upon by a spring 65 and having its end 66 adapted to be turned both in and out of the path of a projection 67 on the member 68 of the clutch 19, which determines whether or not the pulley 18 is connected with or disconnected from the cam shaft 17. When the larger diameter or cam 69 bears on the lever 61 it puts its free end into line with the end 63 of the lever pivoted at 64 so that the end 66 by reason of the travel of the table is thrown out of line with the projection 67.

70, is a two armed spring retracted lever, one end of which bears on the cam 29 and the other end of which engages a counterweighted lever 71 pivoted at 72 and engaging by a slot-and-pin connection 73 with the pawl 49, so that the lever 71 serves to throw the pawls 49 and 49 out of action. also throwing the detent or pawl 74 out of action.

For the sake of a further description, the operation of the machine may be described as follows; it being understood that the movement of the various parts is properly timed: The lever 50 is clamped in such angular position on the ratchet wheel 41 that its guard 52 exposes the requisite number of teeth for the pawl 49 to act on in order to turn the shaft 34 sufficiently by degrees or slow stages for advancing the grinding wheel 3 to the ,position it should occupy when the blank has been ground to the predetermined size, during the grinding operation. The lever which is pivoted at 64 is in such position that the shaft 17 remains at rest and on the completion of the grinding operation the pulley 18 drives the shaft 17. The result of this is that the cam 20 separates the cup centers 9 and 10 in the manner described, thus permitting a finished roll to fall from the machine. At the proper time the cam 27 advances the slide 15, feeding a blank into position to be grasped between the cup centers 9 and 10 and for this purpose the center 10 is released by the cam 20 and projected by the spring 26. The cam 29 has already thrown the pawls out of action and the shaft 30 has revolved the pulley 32 during a part of the revolution of the shaft 30 and this revolution of the pulley 32 has turned the shaft 34 and with it the ratchet wheel 41 and has run the grinding wheel 3 back. The pulley 32 is now at rest and the cam 29 lets the pawls come into action. As the table reciprocates hack and forth the pawl 49 turns the ratchet wheel 41 feeding the grinding wheel forward against the blank and grinding it until the guard 52 throws the pawl 49 out of action and this it does when the blank is of the right size. However, the pawl 49 continues to operate upon the teeth of the lever 53 bringing the arm 56 against the clutch rod and shifts its 1,osa,ses

high part 69 into such position that the lever pivoted at 64 a in throws in the clutch 19 giving the sha 17 one more revolution in w1h icg another cycle of operations is comp ete The cup centers areessential to the success of the mechanism which automatically controls the extreme feed of the grinding wheel in order to make, automatically, rollers of'predetermined size and angle for it is evident and well understood that if either or both of the'centers project into cavities at the ends of the rollers these cavities are not of uniform depth, in which case the finished rollers will not be true to size and are not always central, in which case the angle will be incorrect. The cup, centers not only possess this advantage, but they permit the blank to, as it were, center itself and they also obviate the, expense incident to pro viding the ends of the blank with countersunk centers. Evidently since the machine turns out the blanks accurately and automatically the rate of production is greater than would be the case where the blanks had to be measured from time to time and the machine adjusted manually. I

What I claim is:

l. A roller grinding machine comprising the combination of cup centers of which one is retractile, a grinding wheel adapted to advance and recede, roller blank feeding mechanism for presenting roller blanks to the centers, advancing and retracting feed mechanisms for the grinding wheel, stopmotion mechanism for the feed mechanism, and mechanism for retracting one of the cup centers and for operating the roller feeding mechanism and the retracting feed mechanism upon the completion of the grinding operation and after the stop motion mechanism has operated and for thereafter releasing the cup center and throwing out the I the advancing feed means for the grinding wheel, a cam shaft and connections for operating said mechanisms, devices for intermittently rotating said cam shaft, advancing feed 'means for the grinding wheel, and means for operating the latter when said cam shaft'is at rest, substantially as described.

' In testimony whereof I have hereunto signed my name.

v CHAS. BURGESS HESS. Witnesses:

G. 'S. WoonwARn,

J. T.--ONEILL. 

